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US9954639B2 - Method and devices for controlling signal transmission during a change of data rate - Google Patents

Method and devices for controlling signal transmission during a change of data rate Download PDF

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Publication number
US9954639B2
US9954639B2 US15/311,530 US201515311530A US9954639B2 US 9954639 B2 US9954639 B2 US 9954639B2 US 201515311530 A US201515311530 A US 201515311530A US 9954639 B2 US9954639 B2 US 9954639B2
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signal
data rate
receiver
transmitter
change
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US20170093520A1 (en
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Patricia Layec
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Definitions

  • the present invention relates to signal transmission via communication networks, and more precisely to the change of signal data rate during a signal transmission.
  • the last generation of transceivers i.e. communication equipments comprising a transmitter and a receiver
  • the last generation of transceivers is capable of supporting multiple data rates either by changing the modulation format, or the coding rate or else the symbol rate of signals. This allows the transceiver to switch from one data rate to another one, not only between two signal transmissions or receptions but also during a signal transmission or reception.
  • this last case requires the transceiver to adapt itself on the fly without losing any signal data, which means that the BER (Bit Error Rate) must be maintained below a given threshold.
  • BER Bit Error Rate
  • Such an adaptation requires an update of some of the digital signal processing (or DSP) software blocks into the receiver, which takes a transition time to reach a good convergence with a stable BER performance.
  • the change of symbol rate requires the update of DSP blocks such as the polarization demultiplexing and equalization (for instance employing the MMA (Multi-Modulus Algorithm)), the frame alignment and phase synchronization, and such a move takes a relatively long convergence time.
  • DSP blocks such as the polarization demultiplexing and equalization (for instance employing the MMA (Multi-Modulus Algorithm)), the frame alignment and phase synchronization, and such a move takes a relatively long convergence time.
  • MMA algorithms for instance implement stochastic gradient methods.
  • an object of this invention is to improve the situation by increasing the reliability of a transceiver during a transition phase, for instance to allow the margin provisioned during a data rate change to be reduced.
  • a method is intended for controlling transmission of a signal between a transmitter and a receiver during a phase of change of signal data rate. This method comprises:
  • the method may include additional characteristics considered separately or combined, and notably:
  • a computer program product comprises a set of instructions arranged, when it is executed by processing means, for performing the method presented above to control transmission of a signal between a transmitter and a receiver during a phase of change of signal data rate.
  • a first device is intended for equipping a transmitter, and is arranged, after having been activated following upon a requested change of signal data rate during a transmission of signal by this transmitter to a receiver, for reproducing said signal N times, with N ⁇ 1, in identical signal parts having a chosen length, so that these N identical signal parts be successively transmitted by the transmitter to the receiver to be combined together to produce a combined signal part, and to temporarily output combined signal parts with an auxiliary data rate depending on N and on this signal part length
  • a second device is intended for equipping a receiver and is arranged, after having been activated following upon a requested change of signal data rate during a transmission of signal by a transmitter to this receiver, for storing N retransmitted identical signal parts of this signal, having a chosen length and successively received by the receiver, to combine them together to produce a combined signal part, and to temporarily output the combined signal parts with an auxiliary data rate depending on N and on the signal part length.
  • a transceiver comprises a transmitter, comprising the first device presented above, and a receiver, comprising the second device presented above.
  • FIG. 1 schematically and functionally illustrates two transceivers comprising examples of embodiment of first and second devices according to the invention and connected to a communication network
  • FIG. 2 schematically illustrates in a diagram a first example of temporal evolution of a transceiver data rate during a data rate change involving a single auxiliary data rate
  • FIG. 3 schematically illustrates in a diagram a second example of temporal evolution of a transceiver data rate during a data rate change involving a single auxiliary data rate
  • FIG. 4 schematically illustrates in a diagram a third example of temporal evolution of a transceiver data rate during a data rate change involving two different auxiliary data rates
  • FIG. 5 schematically illustrates in a diagram a fourth example of temporal evolution of a transceiver data rate during a data rate change involving two different auxiliary data rates.
  • the transmitter 2 and the receiver 3 that are involved in a signal transmission, equip respectively first 1 1 and second 1 2 transceivers that are both connected to a communication network 11 (whatever its type (wired or wireless)). But they could be part of any other type of electronic equipment providing a bidirectional or monodirectional communication function.
  • Each transmitter 2 comprises DSP software blocks (not illustrated) that are arranged for producing signals with a chosen modulation format, a chosen coding rate and a chosen symbol rate, and is capable of emitting these produced signals into the communication network 11 .
  • Each receiver 3 is capable of receiving signals transmitted via the communication network 11 , and comprises first 6 and second 7 groups of DSP software blocks that are arranged for processing these received signals depending on their chosen modulation format, chosen coding rate and chosen symbol rate.
  • the first group of DSP software blocks 6 is arranged for performing a chromatic dispersion estimation, a clock recovery, polarization demultiplexing and equalization and carrier frequency and carrier phase estimations.
  • the second group of DSP software blocks 7 is arranged for performing a detection of signal symbols and decoding.
  • the invention proposes notably a method intended for controlling transmission of a signal between a transmitter 2 (here of a first transceiver 1 1 ) and a receiver 3 (here of a second transceiver 1 2 ) during a phase of change of signal data rate.
  • This method comprises first, second and third steps.
  • a first step of this method is initiated at an instant t 1 when a data rate change of a signal is requested during its transmission at a first data rate R 1 .
  • the request of a data rate change is made by the control plane and aims at informing the transmitter 2 and the receiver 3 about its decision.
  • the control plane may rely on a local controller to trigger the change.
  • the transmitter 2 of the signal (concerned by the requested change) and the receiver 3 of this signal are informed of a start of a transition phase at an instant t 2 .
  • the transmission of this information at t 2 is triggered by a local controller or directly by the control plane.
  • transition phase the time duration that a transmitter 2 or a receiver 3 needs to reach a good convergence with a stable BER performance during a change phase. Such a time duration depends on the type of the requested change.
  • This information may be transmitted by means of a dedicated message or a message that is used for another purpose and notably to inform the change of modulation format and/or channel coding and/or symbol rate and/or the number of (sub)-carriers in a multi-carrier transmission.
  • the time difference ⁇ (see FIGS. 2 and 4 ) or ⁇ + ⁇ (see FIGS. 3 and 5 ) between instants t 2 and t 1 is preferably predefined. It corresponds at least to a first guard time interval ( ⁇ ) that is required for both transmitter 2 and receiver 3 to activate their respective first 4 and second 5 devices (described below) to be ready to transmit or receive during the transition phase.
  • ⁇ is given below. So, an information representative of a start of a transition phase is transmitted to both transmitter 2 and receiver 3 once a predefined guard time interval has passed after they received a corresponding change request.
  • signal parts s n of length L may be defined at the symbol level or at the bit level, depending on the chosen implementation.
  • N may be equal to 1 or 2
  • L may be equal to 40% or 50% of the codeword length.
  • other values may be chosen depending on the context and/or on the wished BER performance during the transition phase.
  • the BER performance increases substantially when the number N of retransmissions increases and/or the signal part length L increases, but in return this decreases the auxiliary data rate R a .
  • This second step may be implemented by a first device 4 that equips the transmitter 2 and by a second device 5 that equips the receiver 3 .
  • These first 4 and second 5 devices are activated respectively by the transmitter 2 and the receiver 3 during the above mentioned guard time interval ⁇ or ⁇ + ⁇ (i.e. between t 1 and t 2 ).
  • the first device 4 is arranged, after having been activated by its transmitter 2 , for reproducing the signal to be transmitted N times, with N ⁇ 1, in identical signal parts s n having a chosen length L, so that these N identical signal parts s n be successively transmitted by its transmitter 2 to the concerned receiver 3 to be combined together to produce a combined signal part S, and to temporarily outputs the combined signal parts S with an auxiliary data rate R a depending on N and on the signal part length L.
  • Such a first device 4 is preferably made of software modules, at least partly, that act at the symbol level or bit level, depending on the chosen implementation. But it could be also made of a combination of hardware and software modules acting at the symbol level or bit level by means of FPGA or ASIC for instance. In case where it is made of software modules it can be stored in a memory, possibly after having been downloaded, or in any computer software product.
  • the second device 5 is arranged, after having been activated by its receiver 3 , for storing the N retransmitted identical signal parts s n of the signal (produced by the transmitter 2 and successively received by its receiver 3 ), to combine them together to produce a combined signal part S, in order to temporarily output combined signal parts S with an auxiliary data rate R a depending on N and on the signal part length L.
  • Such a second device 5 is preferably made of software modules, at least partly, that act at the symbol level or bit level, depending on the chosen implementation. But it could be also made of a combination of hardware and software modules acting at the symbol level or bit level by means of FPGA or ASIC for instance. In case where it is made of software modules it can be stored in a memory, possibly after having been downloaded, or in any computer software product.
  • the symbol-level implementation is less complex than the bit-level implementation since the retransmitted identical signal parts s n do not need to be decoded before being combined.
  • the M second functional modules 9 m define M buffers in N of which the N identical signal parts s n , successively retransmitted and received, are temporarily stored before being combined.
  • the first functional module 8 defines a switch arranged for switching the N identical signal parts s n it receives successively into the N buffers 9 1 to 9 N .
  • the third functional module 10 defines a combiner arranged for combining the N identical signal parts s n temporarily stored into the N buffers 9 1 to 9 N to produce a combined signal part S, with an auxiliary data rate R a depending on N and on the signal part length L, that feeds the second group of DSP software blocks 7 .
  • the combiner 10 may be arranged for multiplying each retransmitted identical signal part s n with a weighting coefficient w n , representative of a level of confidence of its retransmission, to generate a weighted signal part w n *s n , and these N weighted identical signal parts w n *s n are added together to produce a combined signal part S defined by:
  • the weighting coefficient w n may depend from the context. For instance, the last retransmission of s 3 may be more reliable than the initial retransmission of s j since the updated algorithm(s) may have converged.
  • the transmitter 2 and the receiver 3 are informed of the end of the transition phase when the signal data rate change is finished (instant t 3 ).
  • the transmission of this information at t 3 is triggered by a local controller or directly by the control plane.
  • This information may be transmitted by means of a dedicated message or a message that is used for another purpose and notably to inform the transmitter 2 and receiver 3 of stable BER performance, hence the first 4 and second 5 devices can be deactivated.
  • FIGS. 2 and 3 Two examples of a data rate change involving a single auxiliary data rate R a are illustrated in the diagrams of FIGS. 2 and 3 .
  • the auxiliary data rate R a is comprised between the first R 1 and second R 2 data rates (but such a choice is not mandatory). After t 3 the transition phase is finished and therefore the second data rate R 2 is guaranteed.
  • auxiliary data rate R a may be equal to the first data rate R 1 in order to reduce the number of times the IP router or OTN switch (which delivers incoming flows to the transceiver 1 ) needs to switch from a data rate to another data rate.
  • the auxiliary data rate R a is smaller than the second data rate R 2 (because during transition period there are N re-transmissions of length L).
  • the transition phase is finished and therefore the second data rate R 2 is guaranteed.
  • the time difference between instants t 2 and t 1 comprises the first guard time interval ⁇ and a second guard time interval ⁇ that corresponds to the case where one desires to send data at the second data rate R 2 to maintain an average data rate that is larger than or equal to the lower data rate R 2 during the time interval ⁇ +T 2 (if one wants an average data rate superior (or equal to) R 2 during the time interval [t 1 , t 3 ], then one could transmit during more time ( ⁇ ) at the highest rate R 1 to ensure this). It is important to note that the second guard time interval ⁇ could be equal to zero or very near from zero.
  • the data rate change involves only a single auxiliary data rate R a .
  • the data rate change could involve at least two auxiliary data rates R aj .
  • the transition phase is divided into j (with j at least equal to two) successive sub phases SP j .
  • the transmitter 2 retransmits the signal N j times, with N j ⁇ 1, in signal parts s nj having a chosen length L j , and the receiver 3 stores the N j retransmitted identical signal parts s nj successively received to combine them together to produce a combined signal part S j , in order to temporarily output the combined signal parts S j with an auxiliary data rate R aj depending on N j and on the signal part length L j .
  • R aj may be greater than R aj-1 or smaller than R aj-1 (notably when the BER is too bad during the first sub phase SP 1 ).
  • the diagram of FIG. 4 corresponds to a non-limitative case where the signal data rate change consists in changing the first data rate R 1 with a second data rate R 2 that is greater than the first data rate R 1 (i.e. R 2 >R 1 ) during the transition phase that occurs between instants t 2 and t 3 .
  • a second auxiliary data rate R a2 greater than R a1
  • is used during a second sub phase SP 2 that occurs between instants t 2 ′ and t 3 (T 4 t 3 ⁇ t 2 ′).
  • the first auxiliary data rate R a1 is smaller than the first data rate R 1 (but such a choice is not mandatory).
  • the second auxiliary data rate R a2 is comprised between the first R 1 and second R 2 data rates (but such a choice is not mandatory). After t 3 the transition phase is finished and therefore the second data rate R 2 is guaranteed.
  • the diagram of FIG. 5 corresponds to a case where the signal data rate change consists in changing the first data rate R 1 with a second data rate R 2 that is smaller than the first data rate R 1 (i.e. R 2 ⁇ R 1 ) during the transition phase that occurs between instants t 2 and t 3 .
  • a second auxiliary data rate R a2 greater than R a1
  • is used during a second sub phase SP 2 that occurs between instants t 2 ′ and t 3 (T 4 t 3 ⁇ t 2 ′).
  • the first R a1 and second R a2 auxiliary data rates are smaller than the second data rate R 2 (because during transition period there are N re-transmissions of length L).
  • the different auxiliary data rates R aj are obtained by varying the number N j of retransmissions and/or the length L j of the retransmitted identical signal parts s nj . After t 3 the transition phase is finished and therefore the second data rate R 2 is guaranteed.
  • the invention allows transceivers to switch from one data rate to another without any traffic disruption and without any need of re-routing traffic through additional transceiver devices. This allows to design a hitless transceiver with low margins to provide the maximum achievable capacity at any time.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)
US15/311,530 2014-05-30 2015-05-29 Method and devices for controlling signal transmission during a change of data rate Active US9954639B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP14305819.6 2014-05-30
EP14305819.6A EP2950474B1 (de) 2014-05-30 2014-05-30 Verfahren und Vorrichtungen zur Steuerung der Signalübertragung während einer Änderung der Datenrate
EP14305819 2014-05-30
PCT/EP2015/061930 WO2015181345A1 (en) 2014-05-30 2015-05-29 Method and devices for controlling signal transmission during a change of data rate

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US9954639B2 true US9954639B2 (en) 2018-04-24

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EP (1) EP2950474B1 (de)
JP (1) JP6526802B2 (de)
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KR102569477B1 (ko) * 2019-07-12 2023-08-24 엘지전자 주식회사 무선 av 시스템에서 적응적으로 rf 전송전력을 제어하는 장치 및 방법

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US20020075897A1 (en) * 2000-10-19 2002-06-20 Samsung Electronics Co., Ltd. Device and method for transmitting data with different qualities in mobile communication system
EP1233564A1 (de) 2001-02-09 2002-08-21 Lucent Technologies Inc. Ratenanpassung in einem Funkübertragungssystem
US20040042465A1 (en) * 2002-09-04 2004-03-04 Lg Electronics Inc. Radio packet data transmission control system and method
EP1821416A1 (de) 2004-12-28 2007-08-22 Matsushita Electric Industrial Co., Ltd. Verfahren und vorrichtung zur sendeleistungsregelung, verfahren und vorrichtung zur übertragungspfadschätzung
US20080027717A1 (en) 2006-07-31 2008-01-31 Vivek Rajendran Systems, methods, and apparatus for wideband encoding and decoding of inactive frames
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US20170188385A1 (en) * 2015-12-23 2017-06-29 Qualcomm Incorporated Resource requirement signaling and rate setting

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Publication number Publication date
EP2950474B1 (de) 2018-01-31
EP2950474A1 (de) 2015-12-02
JP6526802B2 (ja) 2019-06-05
CN106464436A (zh) 2017-02-22
JP2017525307A (ja) 2017-08-31
WO2015181345A1 (en) 2015-12-03
US20170093520A1 (en) 2017-03-30
CN106464436B (zh) 2019-11-05

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